Problems pertaining to compilation of C++ application in g++ (probable cause #ifndef) - c++

Question

I am trying to build a Linked list application using C++ programming language & features such as inheritance etc.
I have split the interface & implementation in different files but not able to compile.
Below are the list of files
Interface files :- node.h , abstractList.h , singleLinkedList.h
Implementation files: singleLinkedList.cpp
node.h
#ifndef NODE_H
#define NODE_H
#include <iostream>
struct nodeType {
int data;
struct nodeType *next;
}listNode;
#endif
abstractList.h
#ifndef ABSTRACT_LIST_H
#define ABSTRACT_LIST_H
#include <iostream>
#include "node.h"
#include "singleLinkedList.h"
class abstractList {
public:
virtual ~abstractList();
virtual bool isEmpty(Node* ) = 0;
virtual int get(const int&) = 0;
virtual int indexOf(const int& ) = 0;
virtual Node insert(const int& , const int& ) = 0;
virtual void delete(const int& ) = 0;
};
#endif
singleLinkedList.h
#ifndef SINGLE_LIST_H
#define SINGLE_LIST_H
#include <iostream>
#include "node.h"
#include "abstractList.h"
class singleLinkedList : public abstractList {
public:
singleLinkedList();
~singleLinkedList();
Node populateList( );
private:
void checkIndex();
int data;
Node head;
};
#endif
So far i have just coded the populateList() function in the implentation file, here goes the implementation file.
singleLinkedList.cpp
#include <iostream>
#include "node.h"
#include "singleLinkedList.h"
#include "abstractList.h"
Node singleLinkedList :: populateList()
{
Node temp;
int data;
temp = head;
char ch;
std::cout<<"Enter Data? (y/n) " << std::endl;
std::cin>>ch;
while(ch == 'Y' || ch == 'y')
{
std::cout<<"Enter the data that you would like to store.\n"<<std::endl;
std::cin>>data;
temp = new Node();
temp->data = data;
temp->next = head;
head = temp;
std::cout<<"Enter more data?"<<std::endl;
std::cin>>"\n">>ch;
}
return temp;
}
When i give g++ -c singleLinkedList.cpp , i am getting lot of errors. I am pretty sure i have done something stupid. Can anyone please pin point my error?
EDIT: Error Log With specfic issues.
struct nodeType {
int data;
struct nodeType *next;
}listNode;
virtual listNode *insert();
Is the above statement correct?
Thanks
Kelly

Answer 1

delete is a keyword in C++, you can't use it as a method name. You need to use a different name here:
class abstractList {
public:
//...
virtual void delete(const int& ) = 0;
//-----------^^^^^^ rename this.
};

Answer 2

The problem is in your typedef:
typedef listNode *Node;
means that all instances of Node will essentially replaced by listnode*
temp = new Node();
actually reads
temp = new listnode*();
But new Foo() would return a Foo* (because new returns a pointer to memory allocated for an object), meaning that new listnode*() would return a listnode**. temp being a listnode* has no Idea what a listnode** is and complains.
what you want to do is:
Node temp = new listnode();
or forget the typedef altogether:
listnode* temp = new listnode();